What are all the attributes that are effected by velocity?

[gib65]

I was just wondering this, because in all my contemplating about velocity and special relativity, I tend to get confused as to what physical attributes of objects get affected in what way. That is, when an object speeds up, does it's mass increase or decrease, does its length increase or decrease. Know exactly what way each attribute changes would surely resolve a lot of pseudo-paradoxes that I arrive at when I try (my damnedest) to visualize such scenarios. I also get confused when trying to remember in what way these attributes change depending on whether I'm talking about the observer or the observed, or the traveler or the stay-at-home. Also, in what way does the DIRECTION effect these attribute changes (i.e. if spacepod A travels at 0.99c in one direction and another spacepod B travels at 0.99c in the opposite direction, do their atributes such as rate of time, mass, length, etc. change in the same direction or opposite directions). So basically, I'm asking:

 

1) What are all the attributes that change?

2) In what direction do they change as a function of velocity?

3) What are the differences between the changes for the observers vs. the observed - and/or - the traveler vs. the stay-at-home?

 

Does anyone know?

[swansont]

Length contracts in the direction of motion. Moving clocks run slow.

[TrueHeart]

Each observer rightfully considers his own observatory to be stock still; no distortions whatsoever occur there.

 

Forget about distortions of mass -- that's a veritable quagmire of confusion and outmoded terminology. Concentrate on the three clock-and-ruler distortions, of which only the time dissynchronicity element is dependent on direction, ie. the earlier clockface readings are forward. Time dissynchronicity might easily get overlooked because it only pertains to spans stretching along the perceived moving entity... if the moving entity is small, considered a virtual point, then time dissynchronicity needn't even be addressed.